Combined cooler and muffler for gas-engines.



No. 784,191. PATBNTED MAR. '7, 1905. T. L. & T. J. STURTBVANT.

COMBINED COOLER AND MUFFLER FOR GAS ENGINES.

APPLICATION FILED 0OT.11.1904.

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UNITED STATES Patented March 7', 1905.

PATENT OEEIcE.

THOMAS L. STURTEVANT, OF QUINCY, AND THOMAS J. STURTEVANT, OF VVELLESLEY, MASSACHUSETTS. ASSIGNORS TO STURTEVANT MILL COAL PANY, OF PORTLAND, MAINE, A CORPORATION OF MAINE.

COMBINED COOLER AND MUFFLER FOR GAS-ENGINES.

SPECIFICATION forming part of Letters Patent No. 784,191, dated March '7, 1905.

Application filed October 11, 1904:. Serial No. 228 025.

To (ti/Z whom it may concern:

Be itknown that we, THOMAS L. STURTEVANT, residing at Quincy, and THoMAs J. STUR'rE- VANT, residing at VVellesley, in the county of 5 Norfolk and State of Massachusetts, citizens of the United States, have invented certain new and useful Improvements in a Combined Cooler and Mufller for Gas-Engines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a combined cooler and muffler for use in connection with explosion gas-engines of the character now extensively in use for driving motor-vehicles and motor-boats; and the invention has for its object to provide a combined cooler and mufli er which will be simple and compact in construction and eflicient in use.

In the accompanyings, Figure 1 is a brokenout longitudinal section of a combined cooler and mufller embodying the present invention, and Fig. 2 is'an end view of the same looking from the right of Fig. 1.

Referring to the drawings, 12 18 denote two 2 5 headers between which extend two series of exposed or uninclosed tubes 14 15. The entrance-header 12 is provided with an opening 16 to receive the exhaust-pipe of the engine, said opening 16 communicating with a circular 3 chamber 17 and the latter in turn communieating with the outer series of tubes 1a, which open into an annular chamber 17 in the header 13. The inner series of tubes 15 extend from the said chamber 17 to the chamber 18 of the header 12, so that the gases flowing outward in the outer series of tubes 14 will flow inward through the inner series of tubes 15 on their way to the chamber of the mufller or mufliingchamber 19, which is provided with an outlet 4 20 for the final exit of the gases. The mufliing-chamber is formed by the cylindrical wall or casing 21, which extends between the headers 12 13.

The desirability of a cooler through which the exhaust-gases are passed on their way to the chamber of the muffler will be well understood by those familiar with explosion gasengines, in that the cooler serves to reduce the volume of the gases, and consequently the back pressure on the engine, and also extracts their heat to such an extent that they do not flame, and if the tubes have suflicient cooling-surface unexploded gases passing from them into themuffler cannot be ignited by the exploded gases following. In the present construction 5 5 such cooler is afforded by the cooling-tubes 14 15, through which the gases are passed on their way to the chamber of the muffler.

To obviate any possible danger of the explosion of the exhaust-gases within the chamber of the muffler, if by chance, as is often the case, the engine should miss, and an unexploded charge of fuel be discharged into the muffler,

a foraminous screen 22, of wire-gauze or other suitable material, (as a finely-perforated metal 6 5 plate,) is preferably interposed between the passage-way from the tubes 15 to the chamber of the muffler, thus forming the chamber 18, heretofore referred to, and from which the gases pass into the chamber of the muffler 7 through the said foraminous screen, and which latter will effectively prevent the entrance of flame from the cooling-tubes into the chamber of the muffler should the cooling-tubes not have sufficientsurface to cool some very hot gases below the ignition-point.

Owing to the fact that in this improved combined cooler and mufller the cooling-tn bes are arranged to surround or encircle the muffler, so as to partly cool the exhaust-gases and reduce the temperatures of the same below the ignition-point before they enter the latter, and also owing to the fact that the headers of the cooler serve also as headers for the mu 1- fler a very compact, eflicient, and compara- 5 tively cheap combined muffler and cooler is provided by the construction herein shown and described, and it has been found by practical tests that with this improved construction of cooler and mufller the exhaust of the 9 engine is almost noiseless and explosions of unusued charges in the muffler are rendered practically impossible.

Having thus described our invention, '0 claim and desire to secure byLetterslatent 5 1. A combined cooler and mufiler for gasengines, consisting of the combination with a mufiler or muflling-chamber, of an exposed cooler entirely outside of but adjacent to said muffler or muiTling-chamber and through which cooler the gases pass to the said mu ffling-chamber.

2. A combined cooler and mufiier for gasengines, consisting of the combination with a mufiier or mufiiing-chamber, of an exposed cooler through which the gases pass before reaching the mufiler, and which cooler is disposed about and adjacent to the said mufilcr and discharges into the latter.

3. A combined cooler and mufiier for gasengines, consisting of the combination with a mufiler or muflling-chamber, of a cooler outside of but adjacent to said mufiler or mufilingchamber, and a foraminous screen in the passage-Way for the gases between the cooler and mufiler.

4. In a combined cooler and mufiler for gasengines the combination with a muflier, of a cooler comprising two headers and a series of exposed tubes communicating with said headers and between which headers the mufiler or mufiiing-chamber is also arranged.

5. In a combined cooler and mufiier for gasengines, the combination with a mu'fl'ler, of a cooler comprising two connected headers having passages between them, and between which headers the said mufiler or mutHing-chamber is also arranged, and a foraminous screen in the passage-way for the gases between the cooler and mufiier.

6. A combined cooler and mufiler for gasengines, consisting of the combination with a mufiler or mufiiing-chamber, of an exposed multitubular cooler surrounding and discharging into said muffler.

7. A combined cooler and muflier for gasengines, consisting of the combination with a mufller or mufliing-chamber, of a multitubular cooler surrounding the same, and a foraminous screen in the passage-wayfor the gases between the cooler and mufller.

8. A combined cooler and mufiier for gasengines, consisting of the combination with two headers provided with chambers and between which headers is a muflling-chamber, of two series of tubes one series of which connects the chambers of said headers and the other series of which forms a communication between the chamber of one of said headers and the mufiling-chamber surrounded by said tubes.

9. A combined cooler and muffler for gasengines, consisting of the combination with two headers provided with chambers and between which headers is a inufiling-chambcr, of two series of tubes one series of which connects the chambers of said headers and the other series of which forms a communication between the chamber of one of said headers and the mufiling-chamber surrounded by said tubes, and a 'l oraminous screen in the passage-way for the gases between the cooler and muffler.

10. A combined cooler and mufller for gasengines comprising two headers, an outer series of exposed tubes through which the exhaust-gases flow outward from the first header to the second, an inner series of exposed tubes through which the exhaust-gases return from the second header to the first, and an inclosed mutHing-chamber entirely within the circle 01 said tubes and between said headers, and into which chamber the gases are discharged from the inner series of tubes.

11. A combined cooler and mufller for gasengines comprising two headers, an outer series of tubes through which the exhaust-gases fiow outward from the first header to the second, an inner series of tubes through which the exhaustgases return from the second header to the first, a mufiling-chamber between said headers into which the gases are discharged from the inner series of tubes, and a foraminous screen in the passage-way for the gases between the cooler and muffler.

12. A combined cooler and mufiler for gasengines, consisting of a series of exposed or uninclosed coolingtubes, and a mufllingchamber adjacent thereto and into which the said cooling-tubes discharge.

In testimony whereof we aflix our signatures in presence of two witnesses.

THOMAS L. STURTEVANT. THOMAS J. STURTEVANTL.

\Vitnesses:

W. H. ELLIs, L. H. S'rUn'ruvAN'r. 

